In just two years, the base has changed greatly, the scope of the base has been continuously expanded, and all the zombies and mutant animals around it have been cleaned up. The strength of everyone in the base has increased a lot, and even young children have the ability to kill weaker zombies. As the strength of the base increased, so did the range of people's activities, and they also assisted several surrounding bases that were almost destroyed, and those bases were subsequently incorporated into Xixi's sphere of influence.

In the past two years, the earth has not grown grass, ordinary land cannot be planted at all, everyone in the base has survived on food before the end of the world, and the exchange system of the star travelers is also used to exchange for clean water and fresh food and daily necessities, but there are not many zombies killed and killed, and the crystal nucleus is becoming less and less, so all kinds of resources are becoming more and more difficult to exchange.

Just when everyone thought that they were destined to perish, everyone found a lush green - the seeds of the sacred tree planted by Gu Rong and Xixi had grown into tall trees.

When they first saw the saplings of the sacred tree, people were a little frightened, and they even thought it was a mutated plant. After all, no normal plant will constantly emit light removal spots, and it can also form a green protective shield with a diameter of several meters around it, and inside the protective cover, there are new flowers and plants, which is obviously full of life, but zombies and alienated animals dare not approach the green cover.

People didn't dare to touch the strange trees easily, until a hunting team was chased by a newborn Zombie Emperor and fled into the green shield in a panic, people knew that the strange glowing trees were harmless to ordinary people.

Those who were lucky enough to escape from the clutches of the Zombie Emperor were pleasantly surprised by the fact that they collected the weeds and mushrooms in the light mask and reported them to the higher-ups as soon as they returned to the base.

The weeds collected from the mask have been tested and proved to have returned to their normal state, non-toxic and harmless, edible to humans, and the clumping mushrooms are also normal mushrooms, no longer poisonous mushrooms that mutate and infect the virus after the end of the world.

Originally, I thought it was just an accident, an accident in a desperate situation, but soon, a news was announced in the base - those unique trees were planted by the leader and the leader's teacher two years ago, and that special tree is a branch of the sacred tree.

Regarding the role of the Divine Tree, it was announced at this time, but it was hidden by Gu Rong that the sap of the Divine Tree could improve its healing ability. The few people who had originally read the research materials of the Divine Tree had already been controlled by Xixi and Gu Rong to prevent anyone from plotting against the Divine Tree.

The existence of the Divine Tree was exposed at this time, and it was decided by Gu Rong and Xixi after consultation with the Divine Tree. The Divine Tree has the effect of purifying the virus, but it has survived on the earth over the years, and the Divine Tree has been very seriously damaged, and its power is simply not enough to exert one percent, and the Divine Tree Tree Spirit has even planned to leave the Earth, which is why the Divine Tree itself in the original world will be destroyed by the Star Travelers, and before the power of the Divine Tree is restored, the saplings planted by the seeds of the Divine Tree are hidden by the protective shield.

Gu Rong and Xixi have been looking for extraterrestrial meteorites for the past two years to use the energy in the meteorite to help the Divine Tree recover, and it is only now that the power of the Divine Tree has been completely restored, and now the Divine Tree is extremely powerful, it can be said that even if all the Star Travelers are dispatched, they cannot threaten the safety of the Divine Tree. It was only then that the Sacred Tree began to appear in front of humans.

Two years have passed, and a lot of sacred tree saplings have been planted, and each of these saplings has grown very well, and each small sapling has opened a purification protective shield to purify a piece of land.

Inside the protective cover of the sacred tree sapling, plants can be planted normally, and even the water source around the divine tree sapling is gradually purified.

The existence of the sacred tree makes people see hope,

Now, the base has been expanded to a wildlife reserve, and the wildlife reserve, which was originally tried by everyone to make a forbidden area, is no longer a threat at this time, and the mutated animals in the reserve have basically been cleaned up, and the people in the base have begun to set off to the new area.

They will migrate to the vicinity of the sacred tree.

The first to be sent out to camp near the Sacred Tree was a convoy of low-level star travelers, and the convoy was speeding down the deserted road at this time.

"Will the Divine Tree really make our exchange system disappear?" said a young man in the car at the head, looking at his wrist and feeling a little apprehensive.

The middle-aged man who was driving turned around and patted the little young man's head, his expression was a little ugly: "It's not that the exchange system has disappeared, it's that the toxins in our bodies and are removed by parasitic machinery, don't you want to get rid of parasites, and you will hesitate?"

With the gradual stabilization of the base, a group of researchers began to emerge, relying on the weapons and a series of instruments that were originally exchanged with the help of the system, plus the alien technology information secretly revealed by Gu Rong, the researchers cracked and researched, and finally discovered the relationship between the exchange system and the virus that caused the end times.

The virus that causes human zombies and animal madness is actually some ultra-miniature semi-mechanical biological and chemical weapons, which are synthetic viruses researched by extraterrestrial organisms, which have both mechanical and viral characteristics, so the infection is extraordinarily strong, because it is too miniaturized, and human beings cannot detect it with today's instruments.

What's even more terrifying is that these cyborg viruses accumulate in the human body to a certain extent, and will use the human body as a medium to assemble a new weapon, that is, the exchange system.

The so-called exchange system is actually the final form of the cyborg-type virus, which selects strong and mentally powerful humans as hosts, and uses the energy in the human body to open a delivery channel to transport the crystal nuclei needed by the aliens, and at the same time transport weapons over. This kind of transportation requires human spiritual power as a pillar, and the zombie crystal nucleus is a concentrated spiritual power supplement, in the process of transmission, part of the energy consumed comes from the system parasite itself, and part of it comes from the transported crystal nucleus.

The exchange system is actually the black technology of the alien planet with a highly developed civilization, and it is a weapon that is expressly forbidden by the cosmic regulations, and only the earth is relatively backward in technology, and the densely populated extraterrestrial planet will be chosen as a colony planet by those aliens.

The star travelers who know the truth will no longer feel that their own carrying system is a good thing at this time, the existence of the system in their bodies only means that they are poor worms who are parasitized, after being parasitized, their spiritual power will always be consumed, and when there is no crystal nucleus to replenish it, they will soon die in pain due to the exhaustion of spiritual power.

At present, those high-level star travelers in the base have begun to have serious mental power consumption, high-level star travelers have riots, and some people have even experienced mental confusion, all of which are consistent with the conclusions reached by the researchers.

Therefore, the star travelers in the base are basically a little panicked now, and they are eager to immediately remove the parasitic system in their bodies.

Of course, the young man who spoke was also afraid of the time bomb-like system, his face turned pale when he heard this, and he shook his head and said, "No, I just thought, after the parasitic system on my body is removed, will I be able to be as powerful as a commander?"

A girl sitting next to the young man clenched her fists and was high-spirited: "Yes, we will all be as powerful as the commander's sister!"

Now, the commander of the base, Lord Gu Zhaoxi, is everyone's idol, the leader of the base at the age of sixteen, powerful, wise and wise, after everything in the base is on the right track, she is called the commander, and she has become the faith of everyone in the entire base.

The middle-aged man looked at the lively young men and women, and wanted to say that there was a reason why the commander was so powerful, but looking at the children with shining eyes, the man finally did not speak, but just glanced at the woman in the co-pilot in awe: "Miss Zhou, are these children too noisy? If you find it annoying, I'll let them be quiet." ”

The young woman looked at the people around her with a smile from beginning to end, shook her head when she heard the words, and said, "This is very good, young people should be lively." ”